Cell measurement method and communications apparatus

Abstract

This application provides a cell measurement method and a communications apparatus. The method may include: A terminal device measures a serving cell, where the serving cell is a satellite cell. The terminal device determines whether the serving cell meets a preset condition. For example, compared with a last measurement result, whether quality of the serving cell becomes better or remains unchanged, or deteriorates but a deterioration magnitude is relatively small. When the serving cell meets the preset condition, the terminal device does not measure or stops measuring the serving cell within a first duration. The terminal device may measure the serving cell after the first duration expires.

What is claimed is: 
     
         1 . A method applied to a terminal device, comprising:
 measuring a serving cell in a first time period, wherein the serving cell is a satellite cell; and   skipping measuring the serving cell within a first duration, when the serving cell meets a preset condition based on measurement of the serving cell in the first time period,   wherein:
 the first duration is determined based on a duration adjustment parameter, 
 the duration adjustment parameter is greater than 0, 
 a quantity of the duration adjustment parameter is determined, when the terminal device determines that the serving cell meets the preset condition, based on a difference between a quality of the serving cell in two measurements, and 
 the quantity of the duration adjustment parameter is used to adjust a duration configured by a network device by adding the quantity of the duration adjustment parameter to the duration configured by the network device, to determine the first duration. 
   
     
     
         2 . The method according to  claim 1 , wherein that the serving cell meets the preset condition comprises at least one of following:
 the quality of the serving cell in the first time period is greater than or equal to a first threshold;   the quality of the serving cell in the first time period is greater than or equal to a quality of the serving cell in a second time period;   a difference between the quality of the serving cell in the second time period and the quality of the serving cell in the first time period is less than a second threshold; or   the serving cell meets a cell selection criterion, and   wherein the second time period is before the first time period, and the second threshold is greater than or equal to 0.   
     
     
         3 . The method according to a  claim 2 , wherein the method further comprises:
 receiving indication information, wherein the indication information indicates at least one of following: information about the first duration, information about the first threshold, or information about the second threshold.   
     
     
         4 . The method according to  claim 2 , wherein that the serving cell meets the preset condition comprises that the quality of the serving cell in the first time period is better than the quality of the serving cell in the second time period. 
     
     
         5 . The method according to  claim 4 , where the first time period and the second time period are two adjacent measurement periods. 
     
     
         6 . The method according to  claim 2 , wherein that the serving cell meets the preset condition comprises that the difference between the quality of the serving cell in the second time period and the quality of the serving cell in the first time period is less than the second threshold, the second threshold is determined based on a pre-configured quality threshold and a threshold adjustment parameter, and the threshold adjustment parameter is greater than 0. 
     
     
         7 . The method according to  claim 1 , wherein the method further comprises:
 when the serving cell meets the preset condition, starting, by the terminal device, a timer by using the first duration as a duration of the timer; and   wherein skipping measuring the serving cell within the first duration comprises:
 skipping measuring the serving cell during running of the timer. 
   
     
     
         8 . The method according to  claim 1 , further comprising:
 re-measuring, by the terminal device, the serving cell; and   skipping, by the terminal device, measuring the serving cell within a second duration, wherein the second duration is determined based on the duration adjustment parameter and the first duration.   
     
     
         9 . A method applied to a network device, comprising:
 generating indication information; and   sending the indication information, wherein the indication information indicates: information about a first duration, and further indicates information about a first threshold, or information about a second threshold, wherein:   the first threshold or the second threshold is used to determine whether a serving cell meets a first preset condition, the second threshold is greater than or equal to 0, the serving cell is a satellite cell, the indication information enables a terminal device to determine whether to skip measuring the serving cell within the first duration based on whether the first preset condition is met, the information about the first duration comprises a duration adjustment parameter, the duration adjustment parameter is greater than 0, a quantity of the duration adjustment parameter is determined, when the terminal device determines that the serving cell meets first preset condition, based on a difference between a quality of the serving cell in two measurements, and the quantity of the duration adjustment parameter is used to adjust a duration configured by the network device by adding the quantity of the duration adjustment parameter to the duration configured by the network device, to determine the first duration.   
     
     
         10 . The method according to  claim 9 , wherein the method further comprises:
 sending a threshold adjustment parameter, wherein the threshold adjustment parameter is used to determine the second threshold.   
     
     
         11 . A communications apparatus, comprising at least one processor, wherein the at least one processor is coupled to a non-transitory memory storing a computer program or instructions, and the at least one processor is configured to execute the computer program or the instructions in the memory, to cause the apparatus to:
 measure a serving cell in a first time period, wherein the serving cell is a satellite cell; and   skip measuring the serving cell within a first duration, when the serving cell meets a preset condition based on measurement of the serving cell in the first time period,   wherein:
 the first duration is determined based on a duration adjustment parameter, 
 the duration adjustment parameter is greater than 0, 
 a quantity of the duration adjustment parameter is determined, when the apparatus determines that the serving cell meets the preset condition, based on a difference between a quality of the serving cell in two measurements, and 
 the quantity of the duration adjustment parameter is used to adjust a duration configured by a network device by adding the quantity of the duration adjustment parameter to the duration configured by the network device, to determine the first duration. 
   
     
     
         12 . The apparatus according to  claim 11 , wherein that the serving cell meets the preset condition comprises at least one of following:
 the quality of the serving cell in the first time period is greater than or equal to a first threshold;   the quality of the serving cell in the first time period is greater than or equal to a quality of the serving cell in a second time period;   a difference between the quality of the serving cell in the second time period and the quality of the serving cell in the first time period is less than a second threshold; or   the serving cell meets a cell selection criterion, wherein   the second time period is before the first time period, and the second threshold is greater than or equal to 0.   
     
     
         13 . The apparatus according to  claim 12 , wherein the apparatus is further caused to:
 receive indication information, wherein the indication information indicates at least one of following: information about the first duration, information about the first threshold, or information about the second threshold.   
     
     
         14 . The apparatus according to  claim 12 , wherein that the serving cell meets the preset condition comprises that the quality of the serving cell in the first time period is better than the quality of the serving cell in the second time period. 
     
     
         15 . The apparatus according to  claim 14 , where the first time period and the second time period are two adjacent measurement periods. 
     
     
         16 . The apparatus according to  claim 12 , wherein that the serving cell meets the preset condition comprises that the difference between the quality of the serving cell in the second time period and the quality of the serving cell in the first time period is less than the second threshold, the second threshold is determined based on a pre-configured quality threshold and a threshold adjustment parameter, and the threshold adjustment parameter is greater than 0. 
     
     
         17 . The apparatus according to  claim 11 , wherein the apparatus is further caused to:
 when the serving cell meets the preset condition, starting a timer by using the first duration as a duration of the timer; and   skip measuring the serving cell during running of the timer.   
     
     
         18 . The apparatus according to  claim 11 , wherein the at least one processor is configured to execute the computer program or the instructions in the memory, to further cause the apparatus to:
 re-measure the serving cell; and   skip measuring the serving cell within a second duration, wherein the second duration is determined based on the duration adjustment parameter and the first duration.